Would it be possible for you to test with RC6 disabled?

To disable RC6, do the following:
Hold down Left-Shift key to enter the Grub menu on boot
Hit 'e' to edit the kernel command line
Append i915.i915_enable_rc6=0 as a kernel boot parameter
For example: linux /boot/vmlinuz-3.2.0-17-generic <...> quiet splash 
vt.handoff=7 i915.i915_enable_rc6=0
Press Ctrl-x to boot

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https://bugs.launchpad.net/bugs/917668

Title:
  system freeze ("hard LOCKUP"), warn_slowpath_common+0x7f in
  sock_aio_read

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